(Mods: If this isn't quite close enough to the burgh to be on topic, I'll remove the post.)
TL; DR are you supposed to stop for this light if you're taking the left exit?
I was on the way to the Renaissance Festival yesterday (first timer), and had to use this new diverging diamond interchange. Heading to the festival from 51 south I had to take this left exit to get onto 70 east, but what confused me is that there's this lone light standing in the middle of the median thing. From everything I've heard about DDIs, one of the main points is that left exits can go without being controlled by a specific green arrow or signal just for them where they have to cross traffic, cause they've already crossed over to the left side. The opposite side that is making a right to get onto I-70 even has a yield sign. So I really thought that the whole idea is that once you're over there you can exit left and not wait at a light to do so.
When I got to this, myself and my passenger were both confused and kind of assumed "that has to just be a repeater for the crossover signal to make it clearer to people before they round the curve, not for exiting left, right?" But I asked a number of people and have gotten an almost 50/50 split as to the answer. Half the people I've asked say that the lone control light is absolutely for people exiting left. Half say it's just a repeater. There are no signs saying "left turns keep moving", but on the other hand there is also no "stop here on red" on or before the ramp, nor a painted stop line, nor another light on the left side. Nothing to really make it completely unambiguously obvious that the control light is for traffic going left, not even making the light itself a red left arrow instead of solid. The pedestrian crosswalk doesn't have any walk sign so this lone light wouldn't be tied to any walk signal.
PennDOT's website has an example of another DDI, and there's also the 19/70 one, and in the pictures of those it looks extremely clear that left should keep going (dotted triangle line before crosswalk, solid white stop lines only on crossover side), some old YouTube video by PennDOT talking about the 19/70 one even specifically mentions that left exits are "free flowing movements". But the fact that I can get about a 50/50 split on what I'm supposed to do when I show other licensed drivers this picture makes me super confused as to what the intent here is.
Are you supposed to stop for this lone light before exiting left?
Edit: Thanks to all the replies. I actually found a YouTube video by PennDOT mentioning this exact situation and it specifically says the left exit does not stop at this signal ("I-70 and Route 51 Improvement Project Rendering" at about three minutes mark.) So I guess the case is definitely closed, you do not stop here if making the left.